This thesis considers the problem of approximating low-rank tensors from data and its use for the non-intrusive solution of high-dimensional parametric partial differential equations (PDEs) and stochastic differential equations (SDEs). High-dimensional here refers to the large number of variables on which the solution depends. The looming curse of ...
Granulierte Aktivkohlen (GAK) leisten bei der Trinkwasseraufbereitung einen großen Beitrag zur adsorptiven Spurenstoffentfernung. Aufgrund der energie- und CO2-intensiven Herstellung und einer zukünftig möglichen Rohstoffverknappung sollten Wasserversorger eine bestmögliche Ausnutzung dieses Aufbereitungsstoffes anstreben. Die GAK-Reaktivierung ist...
During the past years, wireless communication systems have been rapidly advancing to meet the high data-rate requirements of various emerging applications. Since peak data rate and channel capacity are proportional to the operation bandwidth, acquisition of enough bandwidth has become the most critical issue for the next-generation communication sy...
The concept of Physical Unclonable Functions (PUFs) is an attempt to base cryptography on physical possession. This is in contrast to conventional cryptography, where the essential difference of participants in a cryptographic protocol is their knowledge of secret information such as keys and nonces. The literature has a rich body of suggestions fo...
Die vorliegende Arbeit behandelt die Stabilität der Perfectly Matched Layer (PML) Randbedingung in Zeitbereichssimulationen elektromagnetischer Feldprobleme. Die Diskretisierung erfolgt mit der Methode der Finiten Integration, wobei hier die Anwendungsbeispiele rotationssymmetrisch sind und ρ-z-Koordinaten verwendet werden. Bei der PML handelt es s...
In this thesis we develop a framework for interpreting the decisions of highly nonlinear classifier functions with a focus on neural networks. Specifically, we formalise the idea of separating the input parameters into relevant and irrelevant ones as an explicit optimisation problem. First, we describe what is generally understood as a relevance ma...
More than 85% of chemical processes involve the use of heterogeneous catalysts. Supported mono- and multimetallic nanoparticles on different supports are one of the most common classes of heterogeneous catalysts. In these functional materials, the chemical transformations between the substrates take place at the solid-gas or solid-liquid interface....
In the past years, automated driving has been receiving much attention from researchers and engineers around the world. As a result, various advanced driver assistance systems are installed as standard or are far developed. However, they may still fail and request the driver to take back vehicle control. Moreover, drivers are allowed to override th...
The advancing defossilisation of the energy system requires far-reaching interventions and their sound planning to ensure an efficient, safe and sustainable system transformation. The application of electricity demand models with high temporal and spatial resolution is a key element for evaluating different transformation pathways. As a literature ...
When a high-ranking British politician was falsely accused of child abuse by the BBC in November 2012, a wave of short messages followed on the online social network Twitter leading to considerable damage to his reputation. However, not only did the politician’s image suffer considerable damage, moreover, he was also able to sue the BBC for £185,00...
